ci: update path for python tests

Author: steveoh

.github/workflows/pull_request.python.yml

@@ -14,6 +14,9 @@ jobs:
   test-unit-python:
     name: Unit tests 🐍
     runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: /jobs
 
     steps:
       - name: ⬇️ Set up code